2005/03/27 by Paul H. Frampton, PAUL H. FRAMPTON, Thomas W. Kephart +1 · 4 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #hep-ph
paper · pdf · doi:10.1142/s0217732305017688
published as Mod.Phys.Lett. A20 (2005) 1573-1576 · 4 Pages
arxiv created 2005/03/27 · openalex publication_date 2005/07/08 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The 511 keV gamma emission from the galactic core may originate from a high concentration (~ 10 22 ) of primordial black holes (PBHs) in the core, each of whose Hawking radiation includes ~ 10 21 positrons per second. The PBHs we consider are taken as near the lightest with longevity greater than the age of the universe (mass ~ 10 12 kg ; Schwarzschild radius ~ 1 fm ). These PBHs contribute only a small fraction of cold dark matter, Ω PBH ~ 10 -8 . This speculative hypothesis, if confirmed implies the simultaneous discovery of Hawking radiation and an early universe phase transition.